 body {
            font-family: Arial, sans-serif;
            text-align: center;
            margin: 20px;
            background-color: #f0f0f0;
            -webkit-user-select: none; /* Safari */
            -moz-user-select: none; /* Firefox */
            -ms-user-select: none; /* IE10+/Edge */
            user-select: none; /* Standard */
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
        }
        h1 {
            color: #333;
        }
        .control-section {
            margin: 20px 0;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
        }
        .control-section h2 {
            margin-top: 0;
            color: #555;
        }
        .control-panel {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(3, 1fr);
            gap: 10px;
            margin: 20px 0;
        }
        .movement-controls {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(3, 1fr);
            gap: 10px;
            margin: 20px 0;
        }
        .btn {
            padding: 15px;
            font-size: 16px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            color: white;
            transition: background-color 0.2s;
            -webkit-user-select: none; /* Safari */
            -moz-user-select: none; /* Firefox */
            -ms-user-select: none; /* IE10+/Edge */
            user-select: none; /* Standard */
            -webkit-touch-callout: none; /* iOS Safari */
            -webkit-tap-highlight-color: transparent; /* 移动端点击高亮 */
        }
        .btn:active {
            opacity: 0.8;
        }
        .forward {
            grid-column: 2;
            grid-row: 1;
            background-color: #4CAF50;
        }
        .backward {
            grid-column: 2;
            grid-row: 3;
            background-color: #4CAF50;
        }
        .left {
            grid-column: 1;
            grid-row: 2;
            background-color: #2196F3;
        }
        .right {
            grid-column: 3;
            grid-row: 2;
            background-color: #2196F3;
        }
        .stop {
            grid-column: 2;
            grid-row: 2;
            background-color: #f44336;
        }
        .move-left {
            grid-column: 1;
            grid-row: 1;
            background-color: #FF9800;
        }
        .move-right {
            grid-column: 3;
            grid-row: 1;
            background-color: #FF9800;
        }
        .turn-left {
            grid-column: 1;
            grid-row: 3;
            background-color: #9C27B0;
        }
        .turn-right {
            grid-column: 3;
            grid-row: 3;
            background-color: #9C27B0;
        }
        .forward-left {
            grid-column: 1;
            grid-row: 1;
            background-color: #607D8B;
        }
        .forward-right {
            grid-column: 3;
            grid-row: 1;
            background-color: #607D8B;
        }
        .backward-left {
            grid-column: 1;
            grid-row: 3;
            background-color: #607D8B;
        }
        .backward-right {
            grid-column: 3;
            grid-row: 3;
            background-color: #607D8B;
        }
        .btn-group {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 10px 0;
        }
        .btn-small {
            padding: 10px 15px;
            font-size: 14px;
        }
        .servo-control {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
        }
        .servo-input {
            width: 200px;
        }
        .status {
            margin-top: 20px;
            padding: 10px;
            font-weight: bold;
            color: #333;
        }